Boiler-furnace



(No Model.)v y A W. BRAND.

BOILBB PURNAGB. No. 519,787. .Patented May 15, 1894.

UNITED STATES PATENT OFFICE.

WILLIAM BRAND, OF PITTSBURG, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 519,787, dated May 15,1894. Application filed March 3, 1894. SerialNo.' 502,160. (No model.)

To @ZZ whom it may concern..-

Be it known that I, WILLIAM BRAND, a resident of Pittsburg,in the countyof Allegheny and State of Pennsylvania, have invented a new and usefulImprovement in Boiler-Furnaces; and I do hereby declare the following tobe a full, clear, and exact description thereof.

My invention relates to steam boiler furn aces, its object being toprovide a means for distrlbuting the heat from the fire chamber alongthe lower surface of the boiler, and, at the same time, to protect theboiler from too hlgh heat at any one point.

It consists, essentially, in combining with the ordinary cylindricalboiler, a iire or coal .chamber under the forward end thereof having abridge wall at the rear end of said chamber, a combustion chamber beyondthe bridge wall and confined between the bridge wall and a Wall back ofthe same, and a depending wall between said two walls and above thecombustion chamber to forcethe flame and gases down into the combustionchamber and having an arch or roof extending from said depending wallbackwardly over the rear wall of the combustion chamber, so that afterthe ignition of the fire the products of combustion, together with Vtheunconsumed gases and air, will pass over from the bridge wall, strikeagainst the depending wall, and through the heating and intermingling ofthe unconsumedgases and air they will be brought into condition forproper combustion-` of the gases, which will take place within thecombustion chamber back of the fuel chamber, and the flame will thenpass backwardly along the boiler furnace, direct contact of the ame andhighly heated gases with the boiler above the combustion chamber beingprevented by the arch leading backwardly from the depending wall; itbeing found that bya boiler furnace of this construction the fuel ispractically all consumed so that no smoke escapes from the furnace, andthat the amount of fuel necessary for heating is materially reduced.

To enable others skilled in the art to make and use my invention, I willdescribe the `same more fully, referring to the accompanying drawings,in which- Figure l 1s a longitudinal section of a furnace embodying myinvention. Fig. 2 is a cross section ou the line :i3- looking toward thefront end of the furnace; and Fig. 3 is a cross-section on the line:zz-.fr looking toward the rear end of the furnace.

Like letters of reference indicate like parts in each of the figures.

In the drawings a is the boiler, which is a cylindrical boiler and isillustrated as a tubular boiler having a series of tubes extendinglongitudinally through the same, though my invention may of course beemployed with any suitable form of boiler to which it is applicable. Theboiler is supported in the ordinary way within the walls b, and has atthe forward end thereof the chimney flue c, and it is not necessary todescribe these parts more fully. At the forward end of the boiler is thefuel chamber d, which is formed by the front wall e and bridge wall fbetween which the grate bars g extend, the fuel chamber having thefeeding door h, though the chamber may be fedlin any suitable way, suchas by mechanical stokers, if desired. The bridge wall f extends upwardlytoward the lower surface of the boiler and beyond the same is the rearbridge Wall 71:, the space between the two walls f and la forming thecombustion chamber m. Depending within such combustion chamber is thewalln. which is supported on a suitable arch p and extends up along thesides of the boiler between the side walls b b so that the iiame,unconsumed gases, dsc., pass downwardly between the walls f and n intothe combustion chamber m. It will be noticed that the depending wall nis formed closer to the bridge wall f than to the wall k, the spacebetween the walls f and n simply froming a down-take iiueleading intothe combustion chamber m. Above the rear part of the combustion chambermand extending backwardly from the dependingwali n is the arched roof ortop wall r, which extends from the depending wall n backwardly over thecombustion chamber m and preferably to the rear edge of the wall k.Vtfhen the boiler furnace is in use the coal is ignited upon the gratebars g within the fuel chamber d in the ordinary way, air being admittedthrough the ash pits and through the door h, and the flame and heatedproducts rise and strike the lower surface of the boiler a., travelingalong the same. With the iiame IOO and heated products, the unconsumedgases, the carbon held in suspension or smoke, and the air pass over thebridge `wall f and strike against the depending Wall n, being deflectedby the same through the flue Z into the combustion chamber m, and thegases and air becoming intermingled in such passage andhighly heated bycontact with the heated surfaces both of the fire bridgef anddependingwall fn, as Well as the side wa1ls,`so"th'a"ti as or after they enterthe combustion chamber m they unite iwith each other, forming a veryhigh heat within the combustion chamber m, and the highly heatedproducts and iiame therefrom rise from such chamber, striking againstthe roof r and bridge wall fr in the passage t, traveling thence alongthe lower surface of the boiler and passing forward through the tubes oriiues to the smoke stack. In this course the highest heat generated iswithin the combustion chamber m, which is directly below the wall n, andthe heated products in passing upwardly from the combustion chamberraise this wall nto a high heat, which is communicated to the incominggases and air passing downwardly on the other side thereof through theflue Z, and in this way heating the incoming gases and air andmaterially assisting in the combustion thereof,

it being found that the walls are hield at a high heat and thatpractically perfect combustion is obtained in the combustion cham. ber,so that the gases passing from the same are simply products ofcombustion, there being practically no smoke when ythe furnace isoperating in normal condition, and a very protects this part of theboiler from too highheat and directs the dame backwardly along the `lwersurface of the boiler.

It is found that in the operation of the boiler a very high and evenheat is generated, and that practically no smoke escapes from thefurnace except when coal is being fed thereto and the air enters andchills the same, though this can be overcome by the use of theo'rdinnary Stoker.

` What I claim as my invention, and desire to secure by Letters Patent,is

In a boiler furnace, the combination with the boiler, of a fuel chamberat the forward end thereof having a bridge wall, a combustion chamberback of vsaid bridge wall and having a rear bridge Wall, a dependingwall between said bridge walls within the combustion chamber, and anarch or roof extending rearwardly from the depending wall over thecombustion chamber, substantially as set forth.

In testimony whereof I, the said VILLIAM BRAND, have hereunto set myhand.

-WILLIAM ERAN D.

Witnesses:

Ron'r. D. TOTTEN, J. N. COOKE.

